Question

please solve this ....​

Answer 1

$area \: of \: recored \: = area of \: tent \: - area \: of \: the \: ring \: \\ \: \: \: \: = 3.14 \times 30 { }^{2} - 3.14 \times 10 {}^{2} \\ = 3.14 \times 900 - 3.14 \times 100 \\ = 2826 - 314 \\ = 2512$

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